© The Institution of Engineering and Technology
In a passive radar system, the bearing of the target is difficult to measure for the signal-to-noise ratio of the target's echo signal is generally very low in practise. A novel method to estimate the echo signal's angle is proposed. The cross-ambiguity function of direct-path signal and each antenna's receiving signal is calculated to form a virtual array signal, in which the desired echo signal can be enhanced at a certain time delay and Doppler shift, so it is able to estimate its angle. We make the theoretical analysis about how the desired echo signal is enhanced. Some experimental results of an amplitude modulation (AM) radio-based passive radar are presented to verify the effectiveness of the proposed method.
References
-
-
1)
-
3. Wang, J., Wang, H., Zhao, Y.: ‘Direction finding in frequency-modulated-based passive bistatic radar with a four-element Adcock antenna array’, Radar Sonar Navig., 2011, 5, (8), pp. 807–813 (doi: 10.1049/iet-rsn.2010.0262).
-
2)
-
5. Richards, M.: ‘Fundamentals of radar signal processing’ (McGraw-Hill, New York, NY, USA, 2005), pp. 169–176.
-
3)
-
1. Yu, D., Ma, H., Cheng, Li, et al: ‘Method and field experiment of target tracking via multi-static Doppler shifts in high-frequency passive radar’, Radar Sonar Navig., 2016, 10, (7), pp. 1201–1212 (doi: 10.1049/iet-rsn.2015.0472).
-
4)
-
1. Vorobyov, S.A., Gershman, A.B., Luo, Z.Q.: ‘Robust adaptive beamforming using worst-case performance optimization: A solution to the signal mismatch problem’, IEEE Trans. Signal Process., 2003, 51, (2), pp. 313–324 (doi: 10.1109/TSP.2002.806865).
-
5)
-
2. Howland, P.E., Maksimiuk, D., Reitsma, G.: ‘FM radio based bistatic radar’, IEE Proc. Radar Sonar Navig., 2005, 152, (3), pp. 107–115 (doi: 10.1049/ip-rsn:20045077).
-
6)
-
4. Moscardini, C., Conti, M., Berizzi, F., et al: ‘Spatial adaptive processing for passive bistatic radar’. IEEE Radar Conf., Cincinnati, OH, USA, May 2014, pp. 1061–1066.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.4613
Related content
content/journals/10.1049/el.2017.4613
pub_keyword,iet_inspecKeyword,pub_concept
6
6